We've been slowly moving in that direction for quite some time now. Often, when some of those small, individual steps have been noticed and discussed, the discussion tends to (understandably) focus on the declne itself and the problems it brings.
Unfortunately, this almost always ignores another slowly-amplifying aspect of the problem: the gradual conditioning (Pavlov-style) of the people responsible. Each time we - The People - allow abuse of power to go unpunished or a another roadblock placed in the way of our Rights, the politician responsible is trained to do it again. We are very slowly traiing our politicians to believe that nobody will actually stop them. Even worse, we reward some of it, such as when we give paid vacations instead of years-in-prison whenever the police beat somebody up.
So now we have a problem on our hands: we've taught some people that they are above the law. We've taught that the risk of being caught is so close to zero that such concepts don't apply to them. When you have people that no longer fear reprecussions, there is no incentive for them to change. An argument could be made that it would even be a rational decision, given how reliable the historical record has been.
I strongly suspect that we won't see real change until this feedback-loop has been disrupted. Once the usual human level of fear has been re-established, we could see improvments quite quickly, but it has to be real - they have to truly fear that they could be held accountable for their own actions, in some way.
Hypothetically, there are a number of ways such a fear could be created. Traditionally, things like "being voted out of office" and "jail" have been used to decent effect. While I really wish such things were still realistic goals, I fear we have left those opportunities behind in the distant past.
Unfortunately, I fear there only one thing left that can break through the years of conditioning: the sight of one of their peers losing their head to the Guillotine the angry mob constructed for the occasion. It might only take one - fear of that magnitude can shift attitudes amazinly fast. As a pacifist, though, I loath the idea of such a tool could be necessary. There's still time for the players involved to choose one of the better alternatives.
As time goes on, the probability of some person(s) snapping and deciding to "fix" this mess French Revolution style is sounding far more realistic than a bunch of politicians suddenly ignoring years of conditioning and flipping sides, all on their own...
 : or the modern substitute
: ...and really really really hope I am wrong about this